中文摘要：

提出了有效滞止压力的概念来综合考虑流体微团速率与方向对其做功能力的影响，并结合风扇／压气机内部流动的设计要求，从工程应用层面给出了有效滞止压力和压差系数的定义．初步结果表明，有效滞止压力的应用可以更好地反映流动方向对叶轮机非定常流场的影响，并使得流场性能参数对流场质量的变化更敏感，对于合理分析非定常流场是有益的．

英文摘要：

The aerodynamics design of compressor is definitely required for the flow direction, which, however, isn＇t considered in the definition of stagnation pressure. So, the limitation of stagnation pressure appears when describing the performance of unsteady flow in high load fan/compressor. In order to deal with this limitation, available stagnation pressure was presented to consider the influnence on working capability of small flow volume caused by its velocity value and flow direction. And, according to the design demand of flowing in fan/compressor, the concepts of available stagnation pressure and pressure difference coefficent were defined at the level of engneering aplication. The application of available stagnation pressure can reflect more effectively the influence of flow direction on unsteady flow field in turbomachinery, making the performance characters of flow field change more sensitive to the change of quality of flow field. So the available stagnation pressure is useful to analyze the unsteady flow field.